pyproject.toml: Update Ruff configuration with micropython-lib.

- Update to python 3.8 syntax.
- Ignore import not at top of module warnings.
- Exclude common SDK folders.
- Exclude cpydiff test with intentional error.

Also see: micropython/micropython-lib#1059

Signed-off-by: Jos Verlinde <[email protected]>

Author: Josverl

pyproject.toml

@@ -22,11 +22,17 @@ ACKNOWLEDGEMENTS,\
 
 [tool.ruff]
 # Exclude third-party code from linting and formatting
-extend-exclude = ["lib"]
+extend-exclude = [
+    "lib", 
+    "esp-idf", 
+    "pico-sdk", 
+    "emsdk", 
+    "tests/cpydiff/syntax_assign_expr.py" # intentionally incorrect CPython code
+    ]
 # Include Python source files that don't end with .py
 extend-include = ["tools/cc1"]
 line-length = 99
-target-version = "py37"
+target-version = "py38"
 
 [tool.ruff.lint]
 exclude = [  # Ruff finds Python SyntaxError in these files
@@ -43,7 +49,7 @@ exclude = [  # Ruff finds Python SyntaxError in these files
   "tests/micropython/viper_args.py",
 ]
 extend-select = ["C9", "PLC"]
-ignore = [
+extend-ignore = [
   "E401",
   "E402",
   "E722",
@@ -53,6 +59,7 @@ ignore = [
   "F403",
   "F405",
   "PLC0206",
+  "PLC0415", # conditional imports are common in MicroPython  
 ]
 mccabe.max-complexity = 40
 
@@ -64,6 +71,9 @@ mccabe.max-complexity = 40
 "**/manifest.py" = ["F821"]
 "ports/**/boards/**/manifest_*.py" = ["F821"]
 
+"tests/cpydiff/syntax_assign_expr.py" = ["F821"]  # uses assignment expressions
+
+
 [tool.ruff.format]
 # Exclude third-party code, and exclude the following tests:
 #   basics: needs careful attention before applying automatic formatting